package com.dongliu.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.dongliu.reggie.common.BaseContext;
import com.dongliu.reggie.common.R;
import com.dongliu.reggie.entity.ShoppingCart;
import com.dongliu.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 加入购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据：{}", shoppingCart.toString());

        // 设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        // 查询当前菜品或者套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);
        if(dishId != null){
            // 添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId, dishId);
        }else{
            // 添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }
        // SQL: select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if(cartServiceOne != null){
            // 如果已经存在，就在原来的数量基础上加1
            Integer number = cartServiceOne.getNumber() + 1;
            cartServiceOne.setNumber(number);
            shoppingCartService.updateById(cartServiceOne);
        }else{
            // 如果不存在，则添加到购物车，数量默认是1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 减少购物车商品
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        Long userId = BaseContext.getCurrentId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, userId);
        Long dishId = shoppingCart.getDishId();
        Long setmealId = shoppingCart.getSetmealId();
        if(dishId != null){
            queryWrapper.eq(ShoppingCart::getDishId, dishId);
        }
        if(setmealId != null){
            queryWrapper.eq(ShoppingCart::getSetmealId, setmealId);
        }
        shoppingCart = shoppingCartService.getOne(queryWrapper);
        if(shoppingCart != null){
            Integer number = shoppingCart.getNumber() - 1;
            if(number == 0){
                shoppingCartService.remove(queryWrapper);
                shoppingCart.setNumber(number);
            }else{
                shoppingCart.setNumber(number);
                shoppingCartService.updateById(shoppingCart);
            }
        }
        return R.success(shoppingCart);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车...");
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        queryWrapper.orderByDesc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        // SQL: delete from shopping_cart where user_id = ?

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());

        shoppingCartService.remove(queryWrapper);

        return R.success("清空购物车成功");
    }
}
